foo $x,$y,$z    means           foo($x,$y,$z)    For functions,
bar $x,$y,$z    doesn't mean    bar($x,$y,$z)       it depends on the prototype.
print $x,$y,$z  means           print($x,$y,$z)  For named operators,
chr $x,$y,$z    doesn't mean    chr($x,$y,$z)       it depends on the prototype.
not $x+$y+$z    means           not($x+$y+$z)    For other operators,
!   $x+$y+$z    doesn't mean    !($x,$y,$z)         it depends on the precedence.